Machine for forming and welding parts



Aug. 5, 1952 A. F. PlTY O ET AL MACHINE FOR FORMING AND WELDING PARTS I l5 Sheets-Sheet 1 Filed Jan. 15, 1948 A. F. PITYO ET AL MACHINE FOR FORMING AND WELDING PARTS Aug. 5, 1952 15 She ets-Sheet 2 :Filed Jan. 15, 1948 .1952 A. F. PlTYO E'TAL 2,605,537

' MACHINE FOR FORMING AND WELDING PARTS l5 Sheets-Sheet 3 Fiied Jan. 15, 1948 Jlbert z'pw o Harry'E.BuHerf] iQZd/,1/r. W i

Aug. 5, 1952 A. F.,PITYO ET AL MACHINE FOR FORMING AND WELDING PARTS l5 sheets sheet 4 Filed Jan. 15; 1948 ".flzbatkpit a HC ZT'I- LBUML- J;

Aug. 5, 1952 A F. PITYIO ETAL MACHINE FOR FORMING AND WELDING PARTS 15 Sheets-Sheet '5 Filed Jan. 15, 1948 Aug. 5, 1952 A. F. PlTYO ET AL 2,605,537 MACHINE FOR FORMING AND WELDING PARTS 15 Sheets-Sheet 6 Filed Jan. 15, 1948 Elbert F P4111 0 Harry E Buiterfc'eld cil g- 5, 1952 v A. F. PlTYO ETAL I 2,605,537

MACHINE FOR FORMING AND WELDING PARTS 15 Sheets-Sheet 7 Filed Jan. 15, 1948 Aug. 5, 1952 A; F. PlTYO ETAL 2,60

MACHINE FOR FORMING AND WELDING PARTS 15 Sheets-Sheet 8 'Filed Jan. 15, 1948 Aug. 5, 1952 A. F. PlTYQ ETAL MACHINE FOR FORMING AND WELDING PARTS 15 Sheets-Sheet 9' Filed Jan. 15. 1948 Aug. 5, 1952 A. F. PlTYO ET AL MACHINE FOR FORMING AND WELDING PARTS I 15 Sheets-Sheet 10 1 Filed Jan. 15. 1948 AJ'F. PITYO ETAL MACHINE FOR FORMING AND WELDING PARTS 15 Sheets-Sheet 11 Filed Jan. 15, 1948,

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A. F. PITYO ETAL MACHINE FOR FORMING AND WELDING PARTS Aug. 5, 1952 15 Sheets-Sheet 12 Filed Jan. 15, 1948 15 Sheets-S heet =13 A. F; PlTYO ET AL.

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MACHINE FOR FORMINGAND WELDING. PARTS Au'g. 5, 1952,

Fil ed Jan. 15, 1948 g- 1952 A. F. PITYO ETAL 2,605,537 MACHINE FOR FORMING AND WELDING PARTS Filed Jan. 15. 194 15 Sheets-Sheet 14 'fllbert FPitqo Huffy E. BLIHQI'ffQZdgl/l'.

Aug. 5, 1952 J v A. F. PITYO ETAL-r' I 2,605,537

' '3 MACHINE FOR FORMING AND WELDING PARTS Filed Jan. 15, 1948- I' 15 SheetsSheet.l5

Patented Aug. 1 952 umr o PARTS MACHINE For, Font [LNG AND warmers;

Albert P. Pityo, C]ifton,an'd Harry E.

Butterfield, J12, Maplewcod, N. .1.

Application January 15, 194$,Serial No. 2,368

15 Claims. (Cl. 2933) Our invention relates to a machine for forming and welding-parts; I

An important object of the invention isto provide a machineoi the above mentioned character which will form a generally U-shaped thermostatic element, arrange the same in proper relation to the wires of astem and weld the thermostatic element to one wire.

A further object of the invention is to provide a machine of the above mentioned character, which will sever a' section from a bimetal rib bon, form the section into the thermostatic element, and then weld the thermostatic element to one wire of the stem. v I

A further object of the invention is to provide a machine of the above mentioned character which will severe the wires of the stem, so that they will be in the proper lengths.

A further object of the invention is to provide means for bending, shaping, or sizing the thermostatic element after it is welded to one wire of the stem so that such element will be suitably spaced from the other wire of the stem.

A further object of the invention is to provide means to remove the article from the holder, after the completion of the operations, and convey the same to a remote point. i

A further object of the invention is to provide a machine so constructed that the operator may conveniently feed the work to the work holding means. 1 v A further object of the invention is to provide a machine of J the above mentioned character, which is automatic in operation, and will perform the several operations in proper sequence. Other objects and advantages of the invention Figure 8 is a similar view taken on line 8-8 of Figure 6, I r

Figure'9 is a similar view taken on line 9-4? of Figure 6, r

Figure 10 is a similar view taken on line lil-i 9 of Figure 6,

Figure 11 is a vertical section llll of Figure 7,

Figure 12 is a plan View of a base slide,

Figure 13 is a side elevation of-the same,

Figure 14 is a vertical longitudinal section taken online ldl4 of Figure 12,

Figure 15 is a plan view of a reciprocatory transfer element or plunger,

Figure 16 is a side elevation of the same,

Figure 16 1s a transverse section taken'on line isztlfia of Figure 16, Figure 17- is a plan view of an operating slide,

Figure 18 is a vertical longitudinal section taken on line l8l8 of Figure 1'7,

Figure 19 is a side elevation of the ribbon feed mechanism,

Figure 20 is a horizontal section taken on line 28-41! of Figure 19, parts in elevation and the feed jaws in the forward position,

Figure2l is a view similar to Figure 20, with the feed jaws in the rear-position,

Figure 22 is a transverse vertical section taken on line 22-22 of Figure 19,

Figure 21 is a fragmentary side elevation of taken on line 1 therstrip gripping jaws, showing a slight modifi will be apparent during the course of the following description. I

In the accompanying drawings, forming a part of this application, and in which like numerals are'employed to designate like parts throughout the same: g

Figure 1 is a perspective view of a machine embodying our invention,

Figure 2 is a plan view of the same,

Figure 3 is a longitudinal vertical section taken on line 3-3 of Figure 2, V

Figure 4 is a transverse vertical section taken on line 4-4 of Figure 2, t

Figure 5 is a vertical section taken on line 5-5 of Figure 4,

Figure 6 is an enlarged plan view of the ma chine, parts omitted and parts broken away, H

Figure 7 is a transverse section taken on line of Figure 6,

cation, t Figure 23 is a side elevation of the wire severing mechanism, parts in section,

Figure 24 is a transverse vertical section taken on line 2fi-24 of Figure 6,

Figure 23 is a horizontal section through a modified form of arbor and electrode, associated elements being in elevation,

Figure 25 is a plan view of the vertical movable slide which carries the arbor and welding electrodes, and associated elements,

Figure 26 is a vertical section taken on line 26-46 of Figure 25, the arbor being shown in elevation,

Figure 27 is a horizontal section taken on line 21-2! of Figure 28,

Figure 28 is a vertical section taken on line 28-'28 of Figure 25,

Figure 29 is a vertical section taken on line 29-29 of Figure 33,

Figure 30 is an end elevation of the article lifting and discharge mechanism,

Figure 31 is a transverse vertical section taken on line 3I-3l of Figure 29,

Figure 32 is a similar view taken on line 32-32 of Figure 29,

Figure 33 is a plan view of the sizing or bending mechanism and associated elements,

Figure 34 is a transverse section taken on line 34-34 of Figure 33,

Figure 35 i a transverse section taken on line 35-35 of Figure 33,

Figure 33 is a plan view of the stationary block of the bending or sizin mechanism, shown in Figure 33, with an arbor associated therewith,

Figure 29 is a side elevation of the work lifting and discharge mechanism,

Figure 30 is a perspective view of one of the stem holding devices, and the stem held therein,

Figure 31 is a perspective view of the stem or article before the thermostatic element is welded to the wire thereof,

Figure 32 is a similar view showing the thermostatic element welded to the wire,

Figure 32 is a plan view of the stem orarticle with the modified form of thermostatic element welded thereto,

Figures 36 to 41 are plan views, partly diagrammatic, illustrating the several steps performed by the machine.

Figure 42 is a diagrammatic view of the welding circuit.

The machine comprises a frame including a horizontal top and a horizontal bottom 2|, rigidly connected by vertical ends 22, Figures 1 to 3.

Arranged above the top 20 is a horizontal rotatable turret 23, Figures 1, 2, 3, 6, and 29 and this turret is rigidly secured to the upper end of a vertical shaft 24, journaledin a fixed bearing 25, suitably secured to the top 28. Arranged outwardly of and near the fixed bearing is a fixed vertical bearing 26, rigidly attached to the top 28. The bearing 26 receives a vertical shaft 27. The shaft 2'! drives the shaft 24 through the medium of a Geneva movement, of any well known or preferred type. This Geneva movement is designated generally by the numeral 28. The Geneva movement, Figure 3, includes a rotary driven element 29, rigidly mounted upon the shaft 24 and a rotary driving element 30 rigidly mounted upon the shaft 21 and the cam or locking-element 3i, rigidly, mounted upon the shaft 21. For each rotation of the shaft 21 the Geneva movement turns the shaft 24 90 and then locks the same in the indexed position. The shaft 24 is indexed quickly, and is held stationary throughout the major portion of the turning of the shaft 21. The turret 23 is therefore indexed, and held stationary after each turning movement. Rigidly secured to the lower end of the vertical shaft 21 is a bevelled gear 32, driven by a bevelled gear 33 rigidly mounted upon a horizontal shaft 34, journaled in suitable bearings 35. This main drive shaft 34 receives rotation from a sprocket wheel 35, driven by any suitable means.

Arranged upon the upper face of the horizontal turret 23 is a plurality of article holding carriages 31, Figures 1, 2, 3, 6, 30 Four carriages 3'! are shown for the purpose of illustration, spaced 90". These carriages are suitably rigidly secured to the upper ends of vertical shafts 38, Figure 3, included in planetary gearing. These vertical shafts are held within bearings 39, formed upon the turret 23. The shafts 38 extend below the bearings and are rigidly secured to planet gears 40, engaging and traveling about a stationary sun gear 4!, fixed to the upperend of the bearing 25. As shown in Figure 2, when each carriage 31 is in the first or loadin position A, it extends longitudinally of the top 20 and its leading end is forward. When the same carriage 31 is indexed to the second or idling position B, it extends longitudinally of the top 28 but its leading end is rearward. When indexed to the third or working position C it extends longitudinally of the top 20 and its leading end is forward, corresponding to the loading position A. When indexed to the fourth or shaping and discharging position D, the carriage extends longitudinally of the top and its leading end is rearward, corresponding to the second or idling position B. As more clearly shown in Figures 2, 30 31 and 32 the article or stem includes a cylindrical body portion E, usually formed of glass and provided with a flange F. The body portion E carries a flattened extension G and also carries a stem section H, both of which are formed of glass and are integral with the body portion E. Wires I and J are embedded in the body portion E and flattened portion G and extend outwardly beyond the flattened portion G and inwardly beyond the stem portion H. The wires I and J are parallel and spaced.

Each carriage 3'! is provided with means for receiving and holding th article and stem. This means comprises a vertical block 42, mounted upon the top of the carriage 31 and rigidly secured to the carriage and having a V-shaped recess 43 for receiving the stem section H.. The numeral 45 designates a vertical bracket, rigidly attached to the upper face of the carriage 31 and spaced longitudinally from the block 42 and having a vertical slot 46 to receive the stem section H and the inner ends of the Wires I and J. The bracket 45 is provided upon its outer face with a rubber sheet 41', having a slot corresponding to the slot in the bracket 45 and in registration therewith and receiving the same parts as the slot of the bracket. The sheet 41 engages the flange F, and prevents breakage. Rigidly secured to the leading end of the carriage 31 is a vertical bracket 48, spaced longitudinally from the bracket 45, so that the body portion E and flat extension G may be arranged between the bracket 45 and bracket 48, These brackets are so spaced that the fiat portion G will contact with the bracket 48 and the flange F will contact with the compressible rubber sheet 41 and the article will be properly held against perceptible longitudinal movement with relation to the carriage 31. The resilient or rubber sheet 47' presses the fiatportion G against the bracket 43. Any other suitable yielding means may be employed to press the flat portion G against the bracket 48. The bracket 48 has vertical openings 49 to receive the forward ends of the wires I and J.

Mechanism is provided to feed the metal ribbon 5| longitudinally, Figures 1, 2, 3, 6, 19, 20, 21, 22. This mechanism includes a bracket 52, rigidlysecured to the table top 20 and arranged at right angles to the longitudinal axis of the table top, and forwardly of the turret 23. The bracket 52 includes a vertical stationary guide 53, having a horizontal groove 54' formed upon one face thereof, and this horizontal groove receives a horizontally movable slide 54. The slide 54has a stationary jaw 55, carried by a plate 55, which is rigidly secured to the slide 54, as shown at 56. Arranged opposite the stationary jaw 55 is a'movable jaw 56, carried by one arm of a bell crank lever 51, Figure 20. The bell crank lever is mounted within a slot 51' formed in the slide 54 and is pivoted upon a vertical pin 58, secured to the slide. so that the bell crank lever may swing horizontally. One arm .59, .pivoted at .60 cured to a plunger rod .6 I.

I the jaws .5 of this bell crank leveris arrangedwithin an elongated. slot 58', formed in the stationaryguide 53. The transverse. arm of the bell crank lever is pivoted at 519' with a link with a coupling 60, rigidly se- This plunger rod extends into a stationary cylinder 62, and is connected therein with a plunger 52'.. This plunger sis moved forwardly byllcompressed 'air. .The plunger 1 is. moved :in i adreverse spring 63., attachedtoa pin 63,

direction by a secured tothe coupling (Em-when thepressure is cut off'from the cylinder 62,.whereby the movable jaw 56 will open. "-"The bimetal ribbon .51 is arrangedbetween Bland 56, and when therod'fil moves forwardly, the jaw 56 first swings upon its pivot soithat the bimetal ri bbon is elarnpc'dbetween #both jaws, and both-Jaws then move forwardly as a unit tofee'd the bimetal ribbon for a'selected stepr- The swinging movement of thebell crankv 'lever fr'i, to open the'Jaw'56,-is regulated by an adjustable screw or stop 6A; arranged to contact with" the slide 54, and the forward movement of the slide 54- is regulated'by an adjustable stopsfi',

and-its rearward movement by an adjustable stop 66-, Figure 20. We contemplateforming the stationary jaw55, Figure 21 with a projection or rib 55 to enter a transverse groove 55*, formed inthe movable jaw 56. This rib and groove serve to form a lateral projection K upon the U- shaped thermostatic element K, to contact with the long wire J, Figure 32 The'numeral 6t designates a hose, Figures 1 and 20, leadingfrom a source of air pressure and this hose is connectedwith, a pipe 65. The pipe thishose is'connected with a pipe 65. The pipe 65 of a valve'6I which is biased closed. The pipe leads to the cylinder 62'. The valve element of "the valve 61 is biased closed by a spring or the like and this, valve element is opened when a solenoid winding 68 is energized. 'Thepipe E maybe equipped with. valves 69, which. may be manually turned to the opened orclosed positions and are opened when the machine is in operation. Operatingin conjunction with the solenoid r winding 68 Ba switch I0, Figure 3, connected in a circuit with the solenoid winding 69. The

switch is biased open and'has a feeler finger 'II' toengage with the stem section H, of the stem, if the stem is held by the. work holding means. The entire microswitch I0 is vertically reciprocated, in amannerto be explained, and when it descends, the stem H. is, in its path of travel, and if'the blockis holding the stem section H, the feeler finger II will engage this stem and be 'moved upwardly with respect, to the body of the switch. The switchwill be closed and will close the circuit and. the solenoid winding 68 will be energized. The valve 61 is now opened and compressed airlwill besupplicd to the cylinder 62 and the jaws 55 and 56.will feed the bimetal ribbon forwardly a step.v However, if the stem section H is. not' held within .theblock 42, the feeler finger. II willnot have the relative movement,

and hence the valve 61 will remain closed, and the,

metal ribbon 5I will not be fed. This is important, asit eliminates the forming and cutting shaped thermostatic elements K from the bimetal ribbon Ell ,-Figure 132 This mechanism comprises a table or. block 12, having depending sides'IS,

Figures 3, '7, 8, v9, and 10, which are secured to the top 20 by bolts 14'. Thetable orblock-1 2' has a longitudinal slot or passage I5, Figures 3 and 8, and this slot or passage receives a vertically swinging .horn'I2, carried'by a pivot 13, passing through an apertured knuckle I i of the horn,

projecting into a slot I5, formed in the block or table 12', as more clearly shown in Figure-3. The horn I2 extends longitudinally of the top 20 at the central longitudinal axis of the top and swings in a vertical plane and has a verticallyinclined portion Iii, provided at its upper end with a vertical forming jaw 11., havinga curved face 13, Figure 6. l 7

The numeral I9, Figures 3, '7 tom inclusive, and 12 to 18'' inclusive, designates a reciprocatory base slide, operating within a horizontal longitudinal passage 19' formed in the table or block '52, Figure 8-. The base slide 19-, Figures 2' and 3, has pivotal connection at 8I with a link 82, and this link is pivotally mounted upon a pin '83, eecentrically arranged. upon a-horizontalcam disc 8- 3, whereby a rotation of the cam disc 84- will reciprocate the base slide'I-il.

Arranged upon the upper face of the base slide '19, see more particularly Figures 8, 9, and 12 to 14, are strips 85 and S6, rigidly secured to thebase slide by any suitable means as by being formed integral therewith. The strips 85 and 86 extend longitudinally of the base slide T9 and carry forming bars 81, rigidly secured thereto and projecting forwardly beyond the base slide. The forming bars ill are spaced to provide a reduced guide passage 88, and the strips 85- and 83' are spaced'to provide a guide passage 69. A- transfer element 9! is slidabl'e within the-guide passage 89 and has a forwardly extending reduced portion 92, operating within the guide passage 88'. The reduced portion 92 has a rounded recess 93-at its forward end, Figure 15. The forming bars 8'! are provided upon their inner faces at the-guide passage 88 with longitudinal grooves 81, Figures 8 and 14, to receive tongues 88' formed upon the opposite faces of the reduced transfer portion- 92, see more particularly Figures 8, 15, and'16a. The grooves 8'!" extend outwardly through the ends of the forming bars 8'1, Figure 12. The'forming barB'I to the right, Figures 14 and 39; is provided. with an auxiliary groove 93. to receive the long wire J.

Slidably mounted upon the. base slide 19 is a reciprocatory operating slide 94, Figures, 3', 1'7, and 18, having a longitudinal. slot 95 to-receive the transfer element SI and an enlarged transverse opening 96 to receive a cross head 91, formed upon the transfer element. The operating slide $14 has a longitudinal recess 98- for receiving a compressible coil spring 99, which bears against the cross head 91. The upper slide 94 is-reciprocated by a pin I09, rigidly secured thereto and extending through an elongated opening Ifli formed in the base slide I9. The pin carries a roller I92, which travels within an eccentric annular groove I83, formed in the cam disc-84. The cam disc 84 has a depending cam element I 94, Figure 3, to engage a roller I05 mounted upon the rear end of the horn I2. The cam element I04 intermittently engages the roller I05 and thereby swings the horn upon its pivot to raise its forward end. The horn is biased so that its forward end automatically returns to the low.- ered position when the cam element disengages the roller I05. The strips 85 and 86, Figures 8 and9, which are arranged above the base slide I9, operate within a guide passage I05 and the forming bars 81 operate within a guide passage I06, and plates I01 project inwardly over these passages and are secured to the table or block 'I2'.,by any suitable means. It is thus seen that the forming bars 81 and transfer element 9| are guided to reciprocate longitudinally of the top 20, and that the transfer element, 9| is movable with relation to the forming bars 81.

, The cam disc 84, Figure 3, is rigidly mounted upon the upper end of a vertical shaft I00, journaled in a fixed bearing I01. The shaft I06 has a bevelled gear I08 rigidly secured to its lower end and this bevelled gear is driven by a bevelled gear I09, rigidly mounted upon the shaft 34.

As more clearly shown in Figures 6, ll, 12, 13, and 37, one forming bar 87 has a blade or cutter H rigidly secured thereto and having a cutting edge III.

The bimetal ribbon I is fed by the ribbon feeding mechanism through a groove H2, Figure 11, which may be formed in a block I I3 and a blade or insert H4 is held in place by a cap H5, clamped in position by screws H6. The insert H4 provides a cutting edge or shoulder III, for coaction with the cutting edge III, Figure 6.

When the bimetal ribbon 5| is fed through the groove H2, it extends across the upstanding end I! of the horn, Figures 6, 36, and 37, and is contacting with the curved face 18 of the horn, before the forming bars 81 move forwardly. When these bars move forwardly slightly they contact with the ribbon 5I and press the same against the face 18, and the ribbon is slightly bowed and enters the forward ends of the grooves 81' before it is severed by the edge III of the blade. Further forward movement of the forming arms 81 causes the ribbon to be severed and the severed ribbon section is formed about the horn extension 'II into the U-shaped element K, as will be more fully explained.

The numeral H8 designates a vertical arbor, which is vertically movable and has a reduced upper end H9. This vertical arbor is shown more clearly in Figures 5, and 25 to 28. The lower end of the vertical arbor I I8 is mounted upon a block I I8, Figure 27, and preferably has a tongue and groove connection with the block, and the arbor and block are rigidly clamped to a vertically movable slide I20 by means of screws I20. The slide I20 operates within a groove I2I of a fixed guide I2I, arranged beneath the table top 20, having an opening I22, Figure 5. The vertically movable slide I20, Figure 4, is raised and lowered by a bell crank lever I22, including a rock shaft I23 operating in a fixed bearing. This bell crank lever includes a short arm I24 operating within an opening I25 formed in the lower end of the slide I20, and a long arm I26, carrying a roller I2! at its lower end, engaging a cam I28, mounted upon the shaft 34.

After the stem or article is indexed by the turret to the working position C, the arbor H8 rises and its reduced end I I9 is positioned between the wires I and J and project above the same. The forming bars 81 move forwardly to about the transverse center of the reduced end H9 of the arbor, and the U-shaped thermostatic element K surrounds the reduced end of the arbor. The transfer element 9I now moves forwardly and the curved recess 93 of its reduced end receives the end of the U-s'haped element K and the transfer element yieldingly and firmly clamps the U- shaped element K to the rear face of theextension H9 of the arbor. vThe formingbars .81 remain in the forward position while thetransfer element 9I clamps .the U-shaped element to the arbor. After this the. bars 81 :and transfer element are retracted, but the transfer element moves faster. I

Mechanism isv provided to weld the U-shaped thermostatic element K to the short wire I of the stem. This mechanism includesvertically movable upstanding electrodes I29 and I30, which are suitably resilient. Theseelectrodes are mounted upon a block I30 and insulated therefrom, {and this block has a tongue andgrooved connection with the slide I20 and ,theblock is clamped to the slide I20 by a screw I32. Wires I33are connected with the electrodes and form a part of the welding: circuit. ;The electrode I 30 has a horizontal extension I3 I at its upperend.

When the slide I20 is raised to elevate the arbor H8 the straight electrode I29 is disposed inwardly of the short wire-I and the horizontal extension I3I of the electrode I30 is disposed outwardly of the short wire and opposite the electrode I29. When the electrodes are brought together the short wire and U-shaped thermostatic element K are pressed together and the welding occurs.

The welding electrodes I29 and I30 are resilient and are biased open. Means are provided to move the electrodes I29 and I30 toward each other, comprising vertical rock shafts I32 and I33, journaled in openings formed in the table 12. These rock shafts have horizontal arms I34 and I35 rigidly secured to their upper ends, and these arms carry rollers I36 and I31. 'I'heroller I30 is arranged to engage the cam face I38 and the roller I3! cam face I39of a cam block I40, rigidly mounted upon the operating slide 94 Figures 6, 1'7, and 18. The cam face I39 is inclined throughout the major portion of. its length. The arms I34 and I35 areconnected' by a spring I32 which draws them together. Rigidly secured to the lower ends of the rock shafts I32 and I33 are arms MI and- I 42, extending rearwardly, while the arms I34 and I35 extend forwardly, Figure 6. The arm I4I carries'an-insulating pin I43, see more particularly Figure 23, arranged to engage with the electrode I29, while the arm I42 carries an insulating pin I44, arranged to engage with the electrode I30, see also Figure 4. When'the cam block I40 is moved to the left, Figure 6, the rollers I35 and I31 move apart, and the rock shafts I32 and I33 are turned, whereby the free ends of the arms HI and I42 move together and the pins I43 and I44 shift the electrodes I29 and I30 to the inner position. When the electrodes I29 and I30 are in the inner position, Figure 41, these electrodes press the side of the U-shaped thermostatic element K against the short wire I and the welding circuit is closed so that the element K is welded to the short wire. The welding circuit is closed by a cam part I44, carried by the disc 84 and this cam part operates a microswitch I45, connected in the welding circuit, and thereby closes the welding circuit. The switch I45 is biased open and when the cam part I44 disengages the roller I46, the switch I45 will open the welding circuit, Figure 2. The welding circuit may be of any well known or preferred type and includes a suitable timer which will open the circuit independently of the micro switch I45, when the welding period is completed.

In Figure 23 I have shown a-modified form of welding mechanism. In this figure, the numeral 9 I I 9 designates a vertically movable arbor corre- :sponding to the arbor H8. The arbor H9 has an electrode I formed integral therewith. The numeral I3I designates a horizontal reciprocatory electrode. The U-shaped thermostatic element K is applied to the arbor II9 when the arbor is raised" and the transfer element 92 presses the thermostatic element K upon the arbor III). The electrode I3I presses oneend of the thermostatic element K against the short wire I, which bears against the electrode I20 The welding circuit is closed and the elements I and K are welded together at their point of contact.

Mechanism is provided to sever the wires of the stem, Figure to provide the short and long wires I and J, Figure 31. As more clearly shown in Figures 4 and 23, vertical tubular guides I are arranged beneath the table top26 and ri idly secured thereto. These guides slidably receive vertical reciprocatory sleeves I46, having upper and lower cross heads I41 and I48 rigidly secured thereto. Slidable within the sleeves I46 are vertical reciprocatory rods I49, having upper and lower cross heads I50 and I5I rigidly connected therewith, as shown. The microswitch 10 is mounted upon the upper cross head I50, Figure 3. The cross heads I50 and I5I reciprocate as a unit, and for, this purpose a cam strap I52 is connected with the cross head I5I by a ball and socket joint I53. The cam strap I52 engages a cam I54 rigidly mounted upon the shaft 34. The cross heads I41 and I48 move as a unit and to effect this movement the cross head I48 is provided with a depending block I55, rigidly connected-therewith, and carrying a roller I56, operating within a cam groove I51, formedin a cam I58, rigidly mounted upon the shaft 34. The

cross heads I50 and I41 move in opposite directions toward and from each other.

Mounted upon the crosshead I41 is a block I58 having a recess I59 to receive the carriage '31,"see more particularly Figures 5 and. 6. The cross head I41 and block openings I59 and I60, formed therein, Figure 4. Mounted upon the cross head I50 is a block I6I, carrying guide bushings I62, receiving pins I63, rigidly carried by the block I58. Suitably'detachably mounted upon the block I58 are dies I64 and I65, Figures 6, 4, 5, 23 and 36. These dies I64 and I65 when assembled form a large vertical passage I66, also extending through the block I58"and the cross head. The die I64 has a-cutting edge I61, Figures 6 and 36, and the die -I65 has a cutting-edge I68. A cutting blade I69 is arranged for coaction with the cutting edge I61, and is carried by adie I10 rigidly mounted upon the block I6I, Figure 24. A blade III is arranged for coaction with the cutting edge I68and is carried by a die I12 rigidly mounted upon the block I6I'. The blade I69 acts against the edge I61 to cut the wire and form the long wire J, while the blade I1I acts against the edge I68, to cut the wire and form the short wire I. It is thus seen that when the cross heads I50 and I41 move together, when the carriage 31 isindexed to the working position C, the wires of the stem will be severed to form the short and long wires I and .J.

' Means are provided. to bend the 'U-shaped thermostatic element K, to further shape or size the same, so that its free side will be properly spaced from the adjacent wire J. This means is shown more clearly in Figures 2, 33, 34', and 35. This means comprises a stationary guide I59 I58 have vertical head I64.

10 which is rigidly mounted upon the top 20. The guide is horizontal and receives aslide I60, having a carriage I'6I rigidly secured thereto, and projecting laterally therefrom. This carriage is provided with a track or guide I6Ib, receiving a slide I62. The slide I62 is urged forwardly with relation to the carriage I6I'by a compressible coil spring I63, engaging a cross head I64, rigidly mounted upon the carriage ISI. This cross head has a transverse opening for slidably receiving a rod I64, carrying nuts I65. The rod I64 passes through the spring I63 and is tapped into the slide I62. The rod I64 limits the forward movement of the slide I62 with respect to the carriage I6I. The forward end of the slide I62 has an opening I65 formed therein, and the ends I66 of the slide I62 is adapted to contact with the end of the carriage 31. Mounted upon the slide I62 is a block I65 having an opening I66 to receive the U-shaped element K. The numeral I61 designates a bell crank lever, one arm of which is pivoted upon the slide I62, by a pin I68, to swing horizontally. The other arm of the bell crank lever carries a transverse head I69, having spaced tines I10, to receive therebetween the long wire J and to engage withthe long side of the elementK and press the long side inwardly. An adjustable screw IN is carried by the bell crank lever I61, to contact with the long wire J, and bend the same inwardly if necessary. The numeral I13 designates a longitudinally adjustable rod, having an enlarged screw threaded portion I14, adjustably mounted in a screw threaded opening formed in the cross By turning the rod I13 it may be longitudinally adjusted with relation to the cross head and carriage I6 I, and locked in the adjusted position by a nut I15. The adjustment of the rod I13 will control the movement of the lever I61. When the slide I62 and carriage I6I, are in thenormal position, a retractile coil spring I16 which is attached to the bell crank lever I61 and slide I62, will swing the bell crank lever rearwardly upon its pivot, so that it'engages the rod I13, which limits the outward movement of the head I69. The slide I60 is provided at its rear end with a forked head I11, carrying a transverse pin I18, Figures 1 and 33, pivotally connected witha vertically swinging lever I19, mounted upon the fixed pivot I carried by a bracket I8I. The lower end of the lever I19 pivotally engages a transverse pin I82, carried by a reciprocatory bar I83, operating within a fixed guide I84. The inner end of the bar I83 carries a roller I85, engaging a cam I86, rigidly mounted upon the lower end of the vertical shaft 21. It is thus seen that the cam I86 and associated elements move the slide I60 inwardly, and this slide is shifted outwardly by a retractile coil spring I81, which is attached to the slide and to a stationary post I86. It is thus seen that when the slide I60 and its carriage are positively moved forwardly, the slide I62 moves forwardly with the carriage, since the spring I63 is not now compressed. When the ends I66 of the slide I62 engage the carriage 31, the forward movement of the slide I62 is stopped, and further forward movement of the carriage I6I will compress the spring I63 and cause therod I13 to swing the bell crank lever I61 upon its pivot I68, so that the head I69 will be shifted in a direction across the opening I65. The tines I10 will now engage the free or long side of the element K, bending and shaping the same. This side is permanently bent or formed so that it will be spaced the proper 

